Automatic disonnecting device for rock crushers



P. E. VAN SAUN AUTOMATIC DISCONNECTING DEVICE FOR ROCK CRUSHERS Oct. 13. 1927. 1,645,672

Filed May lO. l926 2 Sheets-Sheet 1 Jg' nl Flag-3 v LYVENTOR.

IDETER fowilv MW $40M ain-f 40 BY i 55 D 11 'ITORNEY.

o Q t 27 P. E. VAN SAUN AUTOMATIC DISCONNECTING DEVICE FOR nocx G'RUSHEES Filed May 10. 1926 2 Sheets-Sheet 2' gift/laud Z I ATTORNEY.

Patented Oct. 18, 1927.

- UNITED STATES i PETER EDWIN VAN sAUn; or Los A GELEs, CALIFORNIA.

AUTOMATIC DISCONNECTING DEVICE FOR ROCK GRUSHERS.

Application filed May 10,

. This invention pertains particularly to rock crushers of the gyratory type and specifically to a frangible Coupling for disconnecting the crushers main gyratory shaft "from its driving element.

An important object of the invention is to provide a coupling for connecting rock crusher main operating shafts to their driving elements that will stand a predetermined 10 degree of strain, and on an overload will be instantly disconnected to prevent operation of the main shaft and consequent damage to the crusher mechanism.

A further objectis to provide a coupling that may be readily rendered operative afteri a disconnection or breaking of the frangible elements.

" 1 This disclosure is to be regarded as defscriptive only, and not as restrictive or limitive of the invention, of which obviously an embodiment may be constructed including many minor modifications Without departing from the general scopeherein indicated and hereinafter claimed.

v Broadly an embodiment of the invention," which is here shown in connection with a oyratory rock crushing apparatus of usual orm, consists in forming a connection between the main shaft which carries the crushing head, and its driving element. Thisconne'ctionconsists of one or a plurality of pins here shown' as having a reduced portion between their ends in order that-the break will occur at such portions when an excessive strain is imposed upon the main shaft, or when uncrushable metal objects are accidentally introduced between the crushing jaws or concaves to prevent its operation.

In the' drawings attached hereto and formingja part of this specification, 7

Fig; 1is a central vertical section through a gearless gyratory rock crushing apparatus, showing afrangible coupling.

Fig. 2is an enlarged vertical detail sec- "tion showing the frangible coupling, taken on line2-2 of 1.

Fig. 3''is a plan viewshowing the driving dog'connection plate between the shaft and pulley mechanism.

' Fig. 4is adetaile'd plan view of the connector dog plate. I Fig. 5-is a side .elevation of' one of the frangible coupling pins.

Fig. 6-is an enlarged vertical section through the lower end of a gear driven Fig. 7. V

1926. Serial No. 107,916.

gy ratory crushing apparatus, the coupling being similar to the form shown onzFigo 1. Flg. 71s. a View similar to Fig. 6'showing a modified form of coupling. I Fig. 8is abottom plan view of the conplmg shown in Fig. 7 the'bendable steel plate pouphngs being secured in operative relaion. 1 I

Fig. 9is a viewsimilar to the above. showlng the bendable plate. coupling disconnected.

Fig. 10is a bottom fied form plan view of armodiof the invention was shown in Referring now more particularly to the 7. drawings, and especially toFigs 1--to 5 in clusive, 10, designates astandard gearless gyratory rock crushing apparatus, consisting of 'a heavy bottom shell 11 that carries the dr1v1ng'mechanism,and a top shell 12 carryingvthe hopper 13 at theupper'end' thereof, the concaves 14,:md the main driving shaft 15 pivoted to the spider.

V. The lower end of the main shaft15-is journaled in the sleeve :16. around which is mounted theeccentric 17 rotatably disposed in a bearmg frame 18, suitably secured to the bottom shell 11 of the crusher. --The lower end of-eccentric:17 isv closed. and carries a flat diametrically disposedlug'lt) that engages a similarly shapedslot 20 formed on I the upper face of the driving dog'plate. 21, the under faceof said plate being provided W1th a lug 22 similar to lug l9 that-engages oppositelydisposedslots 23 formed in the circular flange 2 10f the upper shaft cou-' pling member 25. if i I The flange 24 of this -meniber extends below its transverse wall 26 a short distance and 1s provided with an inwardly extending 5 circular flange 27 having an annular. seat 28 formed at its peripheral edge for the reception of a bronze'wear ring 29. Coupling member 25 is disposed in a lower coupling member 30, its inwardly extending flange I 31 engaging the wear ring 29, of the upper "manently secured together in driving relation by one or more frangible pins 35, that pass through bushed openings 36 in the flanges 27 and 31 of the respective upper and lower coupling members, the ends of the pins being apertured for thereception of split cotters 37, (see Fig. 2,) to hold them in place. i

From the above it will be apparent that when power is applied to the crusher through @the medium of the driving pulley that the w two connected coupling members will rotate the eccentric sleeve 17 to impart gyratlon to the crusher driving shaft.

' It frequently happens that during the o1- eration of the apparatus, that metalhc'ob-v jects, such as spikes, excavator teeth, bolts,

nuts, etc. are accidentally fed throughthe 1 machine hopper aiong with the rock, to the crushing; aws or eoncaves, and as such objects are not subject to-breakage like frangiiblemmaterials, accidents to the apparatus were'of frequent occurrence.

1 breakage and consequent damage to the ap- 1 section so that they will shear at the portion In order to overcome such accidental paratus, the pins are designed of proper lying between the two flanges 2d, 30 of the coupling members. This shearing por- ...tion 40 may or may not be of reduced diameter as shown. Under an excessive strain w the pins will quickly break, but as the upper coupling member is nested within the lower member the main shaft and its connected parts will be held in substantial aline- .ment sothatthemotive power may continue I to operate after thepinsphave sheared and.

i the main shaft has ceased to function.

The strength of thepins 35 may be readily and accurately determined by the; capacity of the apparatus to; which they are applied,

and new ones substituted therefor with the. leastdelay. The cost of'a breakage is merely that of the pins, which is only a small fraction of the cost of breakage of I. impor tant portions of such apparatus under old methods of coupling.

the pins 35, being directly connected to the described.

this construction is provided with bevelled eccentricxand a gear drivenmember in exactly similar manner as in the form first The lower coupllng member in gear around its upper edge that meshes with a bevelled drive pinion 46 driven from 60.

a suitable source of power (not shown).

In Figsr7 to 9 inclusive an entirely different' form of coupling mechanism is shown.

hub '50 provided with an opening5l for the .crushingrelation to said first named. jaw, a 130 purpose of affording access to the oil drainage plug 52. This hub is provided with a reduced external end and formed integrally therewith are a plurality of attach- "ing lugs 54 arranged on the right angled diameters of the hub in oppositely disposed pairs. Formed adjacent the peripheral edge of the coupling member 31 and oppositely disposed to lugs 54, are similar lugs 55, flatplates 56 engaging the lugs on the hub and coupling-members, split pins 57 holding the piates in engagement with the lugs during the operation ofthe crusher. These plates are of sufiicient strength to rigidly connect the driving members under ordinary loads and, strains, but should excessive torsional strain be imposed upon the apparatus the plateswill be quickly bent out of engagement with the lugs so to disconnect the couplingmembers as clearly shown in Fig. 9 of the-drawings.

In Fig. 10 is illustrated still another form of coupling disconnecting, means somewhat similar to theform illustrated in Figs. 7 to 9 inclusive, but instead of the bendable plates 56, the lugs 60 on flange 31 of the driving member 32, engage lugs 61 on the hub 50 of the driven member, bolts 62 conn ecting the lugs together. On an overload V itwill be perfectly obvious that the bolts would be parted, thus disconnecting the members. I

As the plates are so positioned as to afford ready access to the same, it will be apparent that the disconnected platesmay be quickly replaced 'bynew onesin short oi-der.

It isobvious that the' forms of disconnectbiecouplings described may be readily applied to various forms and types of rock crashers without entailing any substantial changes in the form of such apparatus and moreover as the connections described are inexpensive of manufacture and easy ofinstallation the cost of the apparatus will not be materiallyincreased.

What I claim is:

bination a frame having a stationary crushlng aw, a movable crushing jaw disposed in v crushing relation'to said first named jaw, a In Fig. 6, the frangible coupling is shown as applied to a gear driven gyratory crusher,

shaftpivoted at its upper end for operatin said movable crushing an eccentric f0? imparting motion to said shaft, a coupling member having a driving means, a second coupling member connected to said eccentric, and. a frangible connection means for securing the couplings in driving relation to each other, said means adapted to disconnect the two coupling members when an excess strain is imparted to the apparatus 2. In arock crushing apparatus, in combination a frame having a stationary crushing jaw,a movable crushing jaw disposed in shaft for operatingsaid movable crushing 1. In a rock crushing apparatus, in comjaw, an eccentric for imparting motion to said shaft, a driving member, and a frangible connection means between the driving member and the eccentric, said means adapted to disconnect the eccentric when an excess strain is imparted to the apparatus.

3. In a crushing apparatus, in combination a pair of crushing jaws, one jaw being disposed in crushing relation to the other 10 jaw, an eccentric for imparting motion to one of the jaws, a driving member, and a connection means between the eccentric and the driving member, said means adapted to disconnect the driving member from the eccentric when an excess strain is imparted to the apparatus. c

In witness that I claim the foregoing .I have hereunto subscribed my name this 30th day of April, 1926. I

PETER EDWIN'VAN SAUN. 

